SOAP - load local WSDL file

Question

How to load a local WSDL file into SoapClient?

$wsdl = __DIR__.'/wsdl.wsdl';
$this->client = new SoapClient($wsdl);

$xsd = __DIR__.'/wsdl/xsd/xmldsig-core-schema.xsd';

PHP Fatal error: SOAP-ERROR: Parsing WSDL: Could not find any usable binding services in WSDL.

relative path to XSD file from WSDL file: ./xsd/xmldsig-core-schema.xsd

WSDL

<?xml version="1.0" encoding="UTF-8"?>
<wsdl:definitions xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" >
    <wsdl:types>
</wsdl:definitions>

Answer 1

In your WSDL file,

<soap:binding style="document" transport="https://schemas.xmlsoap.org/soap/https"/>

should be

<soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/>